What book after Head First Java ?

Hello everyone. I've just finished Head First Java and really enjoyed it. Now i want to read some more advanced books but i don't know any. I'm interested in developing mobile and web applications , so if you can recommend me some books , that would be great.

Mobile app development is a pretty generic phrase; you need to be precise. Which mobile platform are you targeting- iPhone, Symbian, Android? There are many books available for each of these. Also, different platforms require knowledge of different programming languages like Objective-C, Java, C/C++ to name a few.

if you are unsure, you can learn J2ME which is for all constrained devices like mobile phones, smart card application etc.